Android to Send Custom Object to Activity Using Parcelable

November 24, 2021 christo No Comments

Full source code to use the Parcelable interface, which is a faster alternative to Java’s Serializable interface, to send a custom object from our MainActivity to another activity, after we click that particular item in a RecyclerView

Activity2.java

package tech.codingpoint.parcelableexample;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class Activity2 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);

        Intent intent = getIntent();
        ExampleItem exampleItem = intent.getParcelableExtra("Example Item");

        int imageRes = exampleItem.getImageResource();
        String line1 = exampleItem.getText1();
        String line2 = exampleItem.getText2();

        ImageView imageView = findViewById(R.id.image_activity2);
        imageView.setImageResource(imageRes);

        TextView textView1 = findViewById(R.id.text1_activity2);
        textView1.setText(line1);

        TextView textView2 = findViewById(R.id.text2_activity2);
        textView2.setText(line2);
    }
}

activity2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="tech.codingpoint.parcelableexample.Activity2">

    <ImageView
        android:id="@+id/image_activity2"
        android:layout_width="100dp"
        android:layout_height="100dp" />

    <TextView
        android:id="@+id/text1_activity2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/text2_activity2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp" />
</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.codinginflow.parcelableexample.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/darker_gray"
        android:padding="4dp"
        android:scrollbars="vertical" />

</RelativeLayout>

example_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="4dp"
    app:cardCornerRadius="4dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="4dp">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:padding="2dp" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_toEndOf="@+id/imageView"
            android:text="Line 1"
            android:textColor="@android:color/black"
            android:textSize="20sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:layout_marginStart="8dp"
            android:layout_toEndOf="@+id/imageView"
            android:text="Line 2"
            android:textSize="15sp" />

    </RelativeLayout>

</android.support.v7.widget.CardView>

ExampleAdapter.java

package com.codinginflow.parcelableexample;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;


public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
    private ArrayList<ExampleItem> mExampleList;
    private OnItemClickListener mListener;

    public interface OnItemClickListener {
        void onItemClick(int position);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        mListener = listener;
    }

    public static class ExampleViewHolder extends RecyclerView.ViewHolder {
        public ImageView mImageView;
        public TextView mTextView1;
        public TextView mTextView2;

        public ExampleViewHolder(View itemView, final OnItemClickListener listener) {
            super(itemView);
            mImageView = itemView.findViewById(R.id.imageView);
            mTextView1 = itemView.findViewById(R.id.textView);
            mTextView2 = itemView.findViewById(R.id.textView2);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (listener != null) {
                        int position = getAdapterPosition();
                        if (position != RecyclerView.NO_POSITION) {
                            listener.onItemClick(position);
                        }
                    }
                }
            });
        }
    }

    public ExampleAdapter(ArrayList<ExampleItem> exampleList) {
        mExampleList = exampleList;
    }

    @Override
    public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item, parent, false);
        ExampleViewHolder evh = new ExampleViewHolder(v, mListener);
        return evh;
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder holder, int position) {
        ExampleItem currentItem = mExampleList.get(position);

        holder.mImageView.setImageResource(currentItem.getImageResource());
        holder.mTextView1.setText(currentItem.getText1());
        holder.mTextView2.setText(currentItem.getText2());
    }

    @Override
    public int getItemCount() {
        return mExampleList.size();
    }
}

ExampleItem.java

package com.codinginflow.parcelableexample;

import android.os.Parcel;
import android.os.Parcelable;

public class ExampleItem implements Parcelable {
    private int mImageResource;
    private String mText1;
    private String mText2;

    public ExampleItem(int imageResource, String text1, String text2) {
        mImageResource = imageResource;
        mText1 = text1;
        mText2 = text2;
    }

    protected ExampleItem(Parcel in) {
        mImageResource = in.readInt();
        mText1 = in.readString();
        mText2 = in.readString();
    }

    public static final Creator<ExampleItem> CREATOR = new Creator<ExampleItem>() {
        @Override
        public ExampleItem createFromParcel(Parcel in) {
            return new ExampleItem(in);
        }

        @Override
        public ExampleItem[] newArray(int size) {
            return new ExampleItem[size];
        }
    };

    public int getImageResource() {
        return mImageResource;
    }

    public String getText1() {
        return mText1;
    }

    public String getText2() {
        return mText2;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mImageResource);
        dest.writeString(mText1);
        dest.writeString(mText2);
    }
}

MainActivity.java

package com.codinginflow.parcelableexample;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private ArrayList<ExampleItem> mExampleList;

    private RecyclerView mRecyclerView;
    private ExampleAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        createExampleList();
        buildRecyclerView();

    }

    public void createExampleList() {
        mExampleList = new ArrayList<>();
        mExampleList.add(new ExampleItem(R.drawable.ic_android, "Line 1", "Line 2"));
        mExampleList.add(new ExampleItem(R.drawable.ic_audio, "Line 3", "Line 4"));
        mExampleList.add(new ExampleItem(R.drawable.ic_sun, "Line 5", "Line 6"));
    }

    public void buildRecyclerView() {
        mRecyclerView = findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mAdapter = new ExampleAdapter(mExampleList);

        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(mAdapter);

        mAdapter.setOnItemClickListener(new ExampleAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                Intent intent = new Intent(MainActivity.this, Activity2.class);
                intent.putExtra("Example Item", mExampleList.get(position));

                startActivity(intent);
            }
        });
    }
}

android Android, Parcelable, Send Custom Object

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